Synthesis of polyampholyte microgels from colloidal salts of pectinic acid and their application as pH-responsive emulsifiers / Mironov Maxim A.,Shulepov Iliya D.,Ponomarev Vladislav S.,Bakulev Vasily A. // COLLOID AND POLYMER SCIENCE. - 2013. - V. 291, l. 7. - P. 1683-1691.

ISSN/EISSN:

0303-402X / 1435-1536

Type:

Article

Abstract:

A novel method for obtaining cross-linked microgels of apple pectin has been introduced. This method is based on the Ugi four-component condensation in colloidal suspensions of pectinic acid and amines. Using various processing parameters (the polysaccharide concentration, the type and density of crosslink, and the optimal pH range), particles with controlled colloidal properties have been obtained. Lightly cross-linked polysaccharide chains acquire anionic character due to deprotonation of the carboxyl groups at pH 9-10. Increasing the degree of cross-linking leads to a polyampholyte microgel, which can be protonated in acidic medium or deprotonated in basic medium. Polyampholyte microgels derived from apple pectin have proved to be an effective Pickering emulsifier at low concentrations and pH 2-3, forming stable oil-in-water emulsions. These Pickering emulsions exhibited pH-responsive behavior: raising the solution pH to 10 resulted in immediate demulsification due to the destabilization of microgel network at the oil-water interface.

Author keywords:

Apple pectin; Pectinic acid; Colloids; Ugi reaction; Microgel; Emulsion BEHAVIOR; NANOGELS; GELATION; WATER; GELS

DOI:

10.1007/s00396-013-2903-3

Web of Science ID:

ISI:000320578000015

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUL
Publisher	SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013 USA
Language	English
EISSN	1435-1536
Keywords-Plus	BEHAVIOR; NANOGELS; GELATION; WATER; GELS
Research-Areas	Chemistry; Polymer Science
Web-of-Science-Categories	Chemistry, Physical; Polymer Science
Author-Email	m.a.mironov@ustu.ru
Funding-Acknowledgement	Russian Foundation for Basic Research {[}11-03-00579-a]
Funding-Text	The authors thank the members of the center ``Modern Nanotechnology{''} at Ural Federal University for their assistance in DLS and the members of the laboratory ``Comprehensive investigation and expert judgment of organic materials{''} at Ural Federal University for NMR measurement. VAB thanks the Russian Foundation for Basic Research (grants no. 11-03-00579-a).
Number-of-Cited-References	30
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	70
Journal-ISO	Colloid Polym. Sci.
Doc-Delivery-Number	166SP